Dental tool-holder.



J. M. GILMORB.

DENTAL TOOL HOLDER.

APPLIUATIMHLBD JULY 15, 1911.

Patented Aug. 25, 1914.

M ff@ H 'rH NoRmS PETERS ca. PHOTO-1.17740., wAsmrvNfD. b.'

JOHN Vl. GILMORE, 01' CHICAGO, ILLNOIS.

DEIlTAL TGOIl-HLDEB.

Specification oi' lletters Patent.

Application filed July 15, 1911.

Patented fing'. 253', Serial No. 638,645.

To all 'to/windt may concern Be it .known that i, Jenn' M. Glniuonn, a citizen ol the United States, residing` at Uhr cago, in the county et Cook and State oit illinois, have invented a .new and nsetul flinprovement in Dental Tool-Holders, ol which the following1 `is a specitication.

My invention relates more particularly to iinln'ovements in dental apparatus ot' the type involving a hand-piece, or holder, eontaining rotary element ada].)ted to be driven by eitherI manual or machine power, and constructed to rotate tools ot diil'lerent constructions used in operating on teeth.

In performing certain operations upon teeth, it is necessary that very small, slender tools be used, as in the case olf the treatment of pyorrhea where it is necessary to remove `accumulations from the roots oi teeth; and

the conditions attendingI the use et such tools .is oftentimes such as to cause them to be come wedged between teeth or otherwise resistant to turning, with the result of causing` the tool to breal and oftentimes injuring' the mouth oi' the patient. Furthermore, it is desirable that the extent of protrusion ot the tools employed be `variable relative to their suijiportingI mandrels -l'or eintbling` them to penetrate to the desired extent, but without protruding beyond the mandrels to any greater extent than is necessary.

My object is to provide a simple construe tion oi' dental apparatus of the type rejlierred to by which breakage oif the tool in use will be overcome and which. will. permit of the adjustment of the tool in its mandrel, and this lV aceomijilish by the construction hereinafter described.

Referring to the accoinpanying1 drawing` Figure l is a view in elevation, partly sectie-nal, et a common form et hand-piece equipped with my improvement. Fig. 2 is a view in elevation oil one et the sections et the tool supporting,- mandrel shown in Fig. l. Fig. 3 is a similar view et the otherI section oli' the mandrel. Fig. 4l; is a similar View oi the breach shown in l? l, `these three views considered together showing,` the parts illustrated therein in disassembled but related condition; and Fig. 5, an enlarged longitudinal section taken through the mandrel and shcalinsi1 the parts illustrated in liras. 2,- 3 and l in assembled condition.

.lfhe heini-piece et' a dental-engine in non nection with which I have illustrated my invent-ion is represented at tl, and as this hand` piece is oi." a well-known construction, de

script-,ion thereof is deemed unnecessary. l t may, however, he stated that the niemlier 7 located in the hand-piece at its outer endportion is a rotary chuck which is driven .troni the llexible sha'l't (not shown) and ser". to releasably clutch the tool-carrying' mandrel to the driving power. l i' lilly irriproved mandrel, in its preferred enilmdinient,` comprises telescoping,` sections t5 and il, the section 8 being adapted to be inserted inte the outer end ol' the hand-piece and into entrai xnient with the clutch-ineinber 'l'. Both or the sections d and il are tubular. the outer end et the section El beingI open.

at l2, the interl.

the mandrel; the desired :freedom oit viln-a- `z tion et the outer end oi.I the breach is aiiorift ed; and the needle readily enters between the shank ot the breach and the surroundingr `tube in the assembling epe `ation. YWhen it is desired to secure a tool to the n'lainlrel, such for instance as the tool 1.3, which in the ease illustrated is a spiral breach, the tool inserted into the mandrel section Sl to (muse its shank-portion to lie therein, and the section t) with the breach .lil thus positioned therein is then inserted into the open, outer end et the inandrel-section 8, the operator iu this operation holdingl the assen'ibled tool and mandrel-section 9 iirrnly gripped between his lingers or by pliers.` lfn thus as` seinbling the section 9 and tool ll with the section 8, the point of the needle ll enters `the space betr-veen the inner Wall of the seetion 9 and the shank et the tool 13, thereby wedging the needle and shank of the tooll mandrel-section 9 in frictional engagement.

lt will be understood from the foregoing that should the broach 13. when in use, become wedged between teeth, or be caught in a cavity, the frictional engagement of the breach with the needle 1l and the mandrelsection 9 will permit of slippage of the tool with relation to the driving means in the hand-piece and thus prevent the breach from breaking. Manifestly the degree of wedging action produced by the needle 1l coperating with the other parts as stated may be varied as desired by varying the pressure at which these parts are forced into wedging engagement with each other, and thus the resistance to slipping of the tool with relation to the driving means in the hand-piece may be varied, which is of especial advantage where tools of different strength are used. Furthermore, by my improved construction of mandrel the broach, or other tool, to be used, r ay be readily adjusted, as to its extent of protrusion beyond the mandrel, by merely varying the positioning of the breach in the mandrel-section 9 preliminary to` the assembling operation, this being a desirable feature as the tools are very fragile and protrusion of the tool beyond the mandrel to a greater extent than the particular use to which the tool is put requires, is to be avoided. rllhe needle-equipped mandrel-section 8 also has utility when used without the other section 9, as for instance when a wood-polishing point is to be employed, the point being insertible into the outer, open end of the section S and forced therein into engagement at its inner end with the point of the needle 11, causing the latter to penetrate the wood point and spread the inner ends thereof, thus wedging it in the mandrel.

By constructing a mandrel in accordance With my invention, the use of ybreaches in a dental engine for rimming or otherwise operating on root-canals is rendered possible without danger of breaking off the breach in the can al, the slippage provided by my construction prevents the tool from breaking in the event of resistant strains on the broach tending to brealr it.

What l claim as new, and desire to secure by Letters Patent, is-

l.. A mandrel for the purpose set forth, comprising telescoping tubes, the inner one of which is open at both ends and receives the tool to be secured to the mandrel, and wedging means secured to the other of said tubes for frictionally holding the mandreltubes and tool together, adapted to enter between the free end-portion of said tool and the wall of said inner tube, for the purpose set forth.

f. A mandrel for the purpose set forth, comprising telescoping tubes, the inner one of which is open at both ends for receiving the tool to be secured to the mandrel, said inner tube having a beveled inner end-portion, and wedging means carried by the Outer tube for frictionally holding the tool and tubes together, said wedging means adapted to enter between the inner endportion of said tool, and the wall of the beveled end of said inner tube, for the purpose set forth.

8. A mandrel for the purpose set forth,

comprising telescoping tubes, the inner one of which is open at bot-h ends for receiving the tool to be secured in the mandrel, and a needle secured in the other of said tubes and extending lengthwise thereof and adapted to enter between the free end-portion of said tool and the wall of said inner tube, for the purpose set forth.

A mandrel. for the purpose set forth, comprising telescoping tubes, the inner one of which is open at both ends for receiving the tool to be secured in the mandrel, the inner end of said inner tube being beveled,

` and a needle secured in the other of said tubes and extending lengthwise thereof and adapted to enter between the inner portion of said tool and the wall of the inner beveled end of said inner tube, for the purpose set forth.

fr mandrel for the purpose setforth,

l comprising tubes adapted to telescope one with the other and into one of which the tool to be secured is insertible, and means carried by said mandrel opera-ting upon the act of vtelescoping said tubes with a tool in place therein to clamp the tubes together and clamp said tool to the mandrel.

6. A mandrel for the purpose set forth, comprising a tube, a member adapted to telescope with said tube, a tool insertible with said member into said tube, and means for securing said tool in the mandrel.

7. A mandrel for the purpose set forth, comprising tubes adapted to telescope one with the other, the inner one of which is open at both ends for receiving the tool to be secured in the mandrel, and means carried by the other of said tubes operating upon the actv of telescoping the tubes to clamp the tool to the mandrel.

8. A mandrel for the vaurpose set forth, comprising tubes adapted to telescope one with the other, the inner one of which is open at both ends for receiving the tool to be secured in the mandrel, and means carried by the other of said tubes operating upon the act of telescoping the tubes to enter said inner tube and clamp the tool to the mandrel.

9. A mandrel for the purpose set forth, comprising telescoping tubes, the inner one of which is open at both ends for receiving the tool tobe 'secured in themandrel, said inner tube having a portion of the Wall of its inner end eut away, and Wedgng means carried by theouter 'tube `for frctonztlly holding the tool and tubes togethelg said Wedging means being adapted to enter between the inner end-portion of said tool and 'the Wall of the inner tube opposing the eut-` awey portion thereof.

JOHN M;A GILMORE.

In presence of-- AMY C. FISCHER, 1%. SCHAEFER.

Gopies of this patent may be obtainedfor ive cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

